/Engine/Source/Editor/SerializedRecorderInterface/Public/Serializers/MovieSceneSectionSerialization.h
Read a frame range. Completion callback will be called on the game thread.
void ReadFramesAtFrameRange ( uint64 InStartFrameId, uint64 InEndFrameId, [TFunction](API\Runtime\Core\GenericPlatform\TFunction)< void()> InCompletionCallback )